Following bellow is brief instruction for 4 node deployment test Controller & 2xNetwork & Compute on RDO Liberty (CentOS 7.1), which was performed on Fedora 21 host with KVM/Libvirt Hypervisor (32 GB RAM, Intel Core i7-4790 Haswell CPU, ASUS Z97-P ) .Four VMs (4 GB RAM, 4 VCPUS) have been setup. Performing this setup I didn't have any problems with memory
swapping and did have problems with i7 CPU 4 CORES limitations.
Actually , I am forced to to run packstack not because I love it so much ,
because I have no choice.